Agilent Technologies L4400 manual Routseqdef MYSEQ1,ROUTCLOS @10011009OPEN @1001

3Operating and Programming

•When a sequence is defined, the specified commands are checked for proper syntax and absolute parameter range limits. If an error is detected during compilation, the entire sequence will be discarded. More extensive error checking, such as channel range expansion and validation, is performed when the sequence is executed.

•If you define a sequence with a name already in use by another sequence, the new definition will overwrite the previous definition (no error is generated).

•A sequence name can contain up to 30 characters. The first character must be a letter (A- Z), but the remaining 29 characters can be letters, numbers (0- 9), or an underscore ( _ ). Blank spaces are not allowed.

•When stored in memory, the user- defined sequence names are converted to all uppercase letters. For example, when stored “MySeq_1” is converted to “MYSEQ_1”.

•A sequence may invoke another sequence, but may not invoke itself recursively. In addition, the number of invocations is limited to four levels of nesting and this is enforced at the time of execution. Exceeding the limit will abort the sequence and an error will be generated.

•At the time of sequence definition, a sequence may reference another undefined sequence; however, at the time of execution an error will be generated if an undefined sequence is invoked.

•Up to 500 unique sequences can be stored in non- volatile memory. Each sequence is limited to 1024 bytes.

•While a scan is running (see “Scanning Applications" on page 69), the instrument prevents use of all channels in banks that contain one or more channels in the specified scan list (these channels are dedicated to

the scan). Therefore, if a sequence attempts to operate a channel in a scanned bank, an error is generated and the entire sequence will be discarded.

•If the command overlap function is enabled, all switching operations within the sequence follow the overlapping rules. If the command overlap function is disabled, all commands within the sequence are processed in a serial fashion in the exact order in which they are received. Note, however, that within a single command containing a <ch_list> parameter (e.g.,

ROUT:CLOSE (@1001:1010)), the order of the individual switch operations is not guaranteed.

The following command defines a sequence named “MYSEQ_1”, which closes several channels on the instrument and then opens a single channel.

ROUT:SEQ:DEF MYSEQ_1,"ROUT:CLOS (@1001:1009);OPEN (@1001)"

92 L4400 User’s Guide